The fuselages 'have been gone over with a microscope in light of what we've experienced here in the last four months,' Boeing chief executive David Calhoun assured analysts that same month.
The National Transportation Safety Board is only starting its investigation into the causes of the breach. But experts say initial evidence points to an issue with the door plug in question, which is used to block an optional emergency exit on the 737 Max 9 – raising fresh questions about issues in Boeing's supply chain.
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